int dca_sysfs_add_provider()

in dca-sysfs.c [35:61]

• 23 lines of code
• 4 McCabe index (conditional complexity)

int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
{
	struct device *cd;
	int ret;

	idr_preload(GFP_KERNEL);
	spin_lock(&dca_idr_lock);

	ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
	if (ret >= 0)
		dca->id = ret;

	spin_unlock(&dca_idr_lock);
	idr_preload_end();
	if (ret < 0)
		return ret;

	cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
	if (IS_ERR(cd)) {
		spin_lock(&dca_idr_lock);
		idr_remove(&dca_idr, dca->id);
		spin_unlock(&dca_idr_lock);
		return PTR_ERR(cd);
	}
	dca->cd = cd;
	return 0;
}